Concept explainers
Figure P38.10 on the next page shows a monochromatic beam of light of wavelength 575 nm incident on a slab of crown glass surrounded by air. Use a protractor to measure the angles of incidence and refraction. a. What is the speed of the beam of light within the glass slab? b. What is the frequency of the beam of light within the glass slab? c. What is the wavelength of the beam of light within the glass slab?
FIGURE P38.10
(a)
The speed of the beam of light within the glass slab.
Answer to Problem 10PQ
The speed of the beam of light within the glass slab is
Explanation of Solution
Write the expression given by Snell’s for the light ray travelling in two different medium.
Here,
Write the expression to calculate the speed of light.
Here,
Conclusion:
By the use of protractor the angle of incidence is measured as
Substitute
Substitute
Therefore, the speed of the beam of light within the glass slab is
(b)
The frequency of the beam of light within the glass slab.
Answer to Problem 10PQ
The frequency of the beam of light within the glass slab is
Explanation of Solution
Write the expression to calculate the frequency.
Here,
Write the expression to calculate the wavelength of the light travelling in the glass medium.
Here,
Conclusion:
Substitute
Substitute
Therefore, the frequency of the beam of light within the glass slab is
(c)
The wavelength of the beam of light within the glass slab.
Answer to Problem 10PQ
The wavelength of the beam of light within the glass slab is
Explanation of Solution
Conclusion:
Substitute
Therefore, The wavelength of the beam of light within the glass slab is
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Chapter 38 Solutions
Physics for Scientists and Engineers: Foundations and Connections
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